Abstract: A system for assessing sustainability of an overseas gas field development project includes a gas field factor analysis section configured to calculate assessment values for components of gas, expected reserves, ratio of NGL (natural gas liquid)/condensate, and infrastructure accessibility; a financial factor analysis section configured to calculate assessment values for independent oil company (IOC) share ratio, past collaboration experience, business execution experience, and favorable investment ratio; an organization factor analysis section configured to calculate assessment values for development business execution experience, securement level of expertise, the owner's risk, and securement level of dealer; and a sustainability index calculation section configured to calculate a sustainability index, based on the assessment values.

Abstract: A system for analyzing country's business environment of an overseas gas field development project includes a political system stability assessment section configured to calculate a political system stability index; a business execution stability assessment section configured to respectively calculate a general business execution stability index, an upstream expected reward index, a downstream expected reward index, and a business promotion condition index; and an overall business environment assessment section configured to calculate a business environment index, based on the political system stability index, the business execution stability index, the upstream expected reward index, the downstream expected reward index and the business promotion condition index.